JPH05302724A - Heating apparatus and heating method - Google Patents

Abstract

PURPOSE:To improve the homogeneity of heating by separately individually providing a horizontal heater and a plane heater for an article to be heated, judging with a plurality of distance sensors whether the article is longitudinally long or transversely long, and adjusting an output ratio of both heaters. CONSTITUTION:Heating means 14 comprises a first heater 21 for horizontally irradiating an article 11 to be heated with microwaves, and a second heater 2 for vertically irradiating the article 11 with microwaves. Judgement means 14 controls the article 11 to be longitudinally long or transversely long on the basis of detection signals from distance sensors 31a to 31d. Further, the judgement means 14 determines the amounts of outputs from inverter circuits 42, 43 such that an output of the first heater 21 is greater upon the article 11 being judged to be longitudinally long while an output of the second heater 22 is greater upon the same being judged to be transversely long. Hereby, homogeneous heating in longitudinal and plane directions is kept.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for irradiating an object to be heated with microwaves for heating and a heating method thereof, and more particularly to a heating device which is excellent in uniform heating in a plane direction and a height direction. It relates to the heating method.

[0002]

2. Description of the Related Art As a conventional technique for a heating device (microwave oven), a technique for ensuring a flat uniform heating property is described below.
There are so many to enumerate. On the other hand, as for the object to be heated having a large height, very few have pursued the uniform heating property in the height direction.

However, in actual cooking, there are some objects to be heated which are vertically long and which are bulky in the height direction, and it is naturally desired to provide a heating device capable of sufficiently ensuring uniform heating even for objects having such a shape. Think of things.

In view of this demand, as a conventional technique aiming at uniform heating of a vertically long object to be heated, Japanese Patent Laid-Open No. Sho 60 has been proposed.
-138897 was issued. This is as shown in FIG.
High-frequency power supply ports 2a and 2b are provided on the side wall of the heating chamber 1 at a plurality of positions above and below. In FIG. 17, 3 is a magnetron,
Reference numeral 4 is a waveguide, 5 is an object to be heated, and 6 is a rotating dish.

[0005]

In the conventional example shown in FIG. 17, although the heated object 5 having a high height can be uniformly heated in the height direction to some extent, it is low, flat, and has a relatively large area to be heated. When the object 5a is heated, the uniform heating property deteriorates in the plane direction.

In view of the above problems, the present invention provides a heating device and a heating device capable of simultaneously ensuring uniform heating properties in the height direction and uniform heating properties in the plane direction and improving the uniform heating properties as a whole. The purpose is to provide a method.

[0007]

As shown in FIGS. 1 to 7, a heating means main body 13 for accommodating an object to be heated 11 and an object to be heated in the heating means body 13 are provided. In the heating device provided with the heating means 14 for heating 11, the heating means 14 uniformly heats the object 11 to be heated 11 in the horizontal direction and the first heater 21 which uniformly heats the object 11 to be heated in the vertical direction. And a second heater 22 for heating,
The heating device main body 13 has a shape detecting means 15 for detecting whether the object 11 to be heated is vertically long or horizontally long, and both the heaters 21 and 21.
A control circuit 16 for adjusting the output of the second heating device is provided, and the control circuit 16 determines, based on the signal from the shape detecting means 15, that the object 11 to be heated is vertically long. The output of the second heater 22 is set to be large when it is determined that the object to be heated 11 is horizontally long.

The problem solving means according to claim 2 of the present invention is that the shape detecting means 15 according to claim 1 comprises a plurality of distance sensors 31a to 31d.
31d are arranged at different height positions Ha to Hd, respectively.

According to a third aspect of the present invention, there is provided a method for heating a heating device, wherein an object 11 to be heated is placed and heated on a rotary dish 12 in the heating device body 13, wherein the heating device body 13 is heated during heating. With a plurality of distance sensors 31a to 31d arranged at different height positions Ha to Hd, the diameter from the central axis 19 at each of the height positions Ha to Hd of the object to be heated 11 is detected and calculated, and this detection calculation operation is performed. While rotating the rotary plate 12 around the central axis 19, each rotation angle position P1,
P2, ..., and an approximate value of the cross-sectional area of the object to be heated 11 for each of the height positions Ha to Hd is calculated based on the detection calculation result, and whether the object to be heated 11 is vertically or horizontally long is calculated from the calculation result. When it is determined that the object 11 to be heated is vertically long, the first heater 21 uniformly heats the object 11 to be heated vertically, and when it is determined that the object 11 to be heated is horizontally long. The second heater 22 uniformly heats the object to be heated 11 in the horizontal direction.

The problem solving means according to claim 4 of the present invention is, as shown in FIGS. 8 to 16, the shape detecting means 15 according to claim 1,
One distance sensor 31 arranged on the inner wall surface of the heating chamber 13a
consists of x, measuring angles relative to the object to be heated 11 in the distance sensor 31x is any height H _1-1 to H _nn of the object to be heated
The distance L _{1-1 to} L _nn from the inner wall surface of the heating chamber 13a is variable.

According to a fifth aspect of the present invention, in a heating method of a heating device for placing and heating an object to be heated 11 on a rotary dish 12 in a heating device body 13, a measuring angle with respect to the object to be heated 11 at the time of heating. The central axis 1 at any height position H _{1-1 to} H _nn of the object to be heated is changed by changing the measurement angle by one distance sensor 31 x whose variable
The diameter from 9 is detected and calculated, and this detection and calculation operation is performed for each rotation angle position P1, P2, ... While rotating the rotary disc 12 around the central axis 19, and an arbitrary height is calculated based on this detection and calculation result. The approximate value of the cross-sectional area of the object to be heated 11 for each of the positions H _{1-1 to} H _nn is calculated, and the object to be heated 1 is calculated from this calculation result.
When 1 is vertical or horizontal, and when it is determined that the object 11 to be heated is vertically long, the object 11 to be heated is uniformly heated in the vertical direction by the first heater 21, and the object 11 to be heated is horizontally long. When it is determined that there is, the second heater 22 uniformly heats the object 11 to be heated in the horizontal direction.

[0012]

In the means for solving the problems according to the above-mentioned claims 1 to 3, while rotating the rotary plate 12 about the central axis 19, the distance sensors 31a to 31d detect the distances La to Ld at each constant angle. Based on this, an approximate value of the cross-sectional area of the object to be heated 11 at each of the height positions Ha to Hd is calculated. Then, the volume of the object to be heated 11 is calculated and it is determined whether the object to be heated 11 is vertically long or horizontally long. When it is determined that the object to be heated 11 is vertically long, the first heater 21
When the object 11 to be heated is determined to be horizontally long, the output of the second heater 22 is set to be relatively large.

[0013] In one the claims 4, 5 or distance sensors 31x, while changing the measurement angle, detects the distance L _1-1 ~L _nn for each measurement angle.

Then, only one distance sensor 31x needs to be provided.

[0015]

【Example】

[First Embodiment] FIG. 1 is a schematic view of heating a vertically long object in the heating apparatus of the first embodiment of the present invention, and FIG. 2 is a horizontally long object in the heating apparatus of the first embodiment of the present invention. FIG. 3 is a schematic diagram showing a shape detecting means, FIG. 4 is a schematic diagram showing a structure of a distance sensor alone, FIG. 5 is a control block diagram showing a control circuit, and FIG. 6 is a rotary dish. FIG. 7 is a diagram showing the operation of detecting the diameter of the object to be heated from the central axis for each rotational angle position of FIG. 7, and FIG.

As shown in the figure, in the heating device (microwave oven) of this embodiment, the object 11 to be heated is exposed to the microwaves generated by vertical plane irradiation and the horizontal direction microwaves at the same time. By adjusting the irradiation intensity, the planar uniform heating property of the object 11 to be heated and the uniform heating property in the height direction are simultaneously satisfied. That is, the heating device includes a heating device main body 13 in which a rotary dish 12 on which the article to be heated 11 is placed is installed, and heating means 14 for irradiating the article to be heated 11 on the rotary dish 12 with microwaves to heat the article.
A shape detecting means 15 for detecting whether the object 11 to be heated is vertically long or horizontally long, and a control circuit 16 for adjusting the output of the heating means 14 based on a signal from the shape detecting means 15.

As shown in FIGS. 1 and 2, the heating device main body 13 includes an oven chamber (heating chamber) 13a and an outer box 1 outside thereof.
3b and.

The rotary plate 12 is the oven chamber 13a.
Is arranged at the bottom of the motor and is driven by a motor 20 so as to rotate horizontally around the central axis 19.

The heating means 14 includes a first heater (hereinafter referred to as a first magnetron) 21 for horizontally irradiating the object to be heated 11 with microwaves, and a first heater 21 for vertically irradiating the object to be heated 11 with microwaves. It is composed of two heaters (hereinafter referred to as a second magnetron) 22. Both magnetrons 2
1, 22 have high output characteristics of 400 to 600 W, and are supplied with power by inverter circuits 42 and 43 described later.

The first magnetron 21 is communicated with a first high frequency power supply port 26 at the center of the side wall surface of the oven 13a via a first waveguide 25.

The second magnetron 22 is communicated with a second high frequency power supply port 28 at the center of the top surface of the oven 13a via a second waveguide 27.

As shown in FIGS. 1 to 3, the shape detecting means 15 includes four distance sensors 31a, which are arranged at different height positions Ha to Hd on the side wall of the oven chamber 13a at regular intervals h. ~ 31d. As shown in FIG. 3, the distance sensors 31a to 31d have height positions Ha to
The distances La to Ld from the object to be heated 11 are detected at Hd. As shown in FIG. 4, the sensor box 32 has a light emitting element 33 and a light receiving element 34, respectively.
In front of 3, 34, a condenser lens 3 for improving the light directivity
5, 36 are arranged. Then, the time from the light emission of the light emitting element 33 to the light reception by the light receiving element 34 after being reflected by the object 11 to be heated is detected, and based on the time taken here, the distance sensors 31a to 31d detect the time. The separation distances La to Ld to the heated object 11 are detected.

As shown in FIG. 5, the control circuit 16 determines whether the object 11 to be heated is vertically long or horizontally long based on the detection signals from the distance sensors 31a to 31d.
And the first inverter circuit 4 for driving and controlling the magnetrons 21, 22 based on the judgment signal from the judgment means 41.
2 and the second inverter circuit 43.

As the judging means 41, a general micro computer chip having a ROM, a RAM and a CPU is used, and it operates in the following procedure based on the program in the ROM.

While rotating the rotary plate 12 about the central axis 19, the distances La to Ld detected by the distance sensors 31a to 31d are stored for each rotational angle position P1, P2, ....

Based on the received distances La to Ld, an approximate value of the cross-sectional area of the object to be heated 11 at each of the height positions Ha to Hd is calculated.

The volume of the object 11 to be heated is calculated from the approximate value of the cross-sectional area of the object 11 to be heated at each of the height positions Ha to Hd, and it is determined whether the object 11 to be heated is vertically long or horizontally long.

The total output amount is roughly estimated from the volume of the object to be heated 11, and when it is judged that the object to be heated 11 is vertically long, the output of the first inverter circuit 42 becomes relatively large, Conversely, when it is determined that the object to be heated 11 is horizontally long, the output amounts of the inverter circuits 42 and 43 are determined so that the output of the second magnetron 22 becomes relatively large.

The inverter circuits 42 and 43 are generally composed of a rectifier circuit that rectifies a commercial power source to produce an unsmoothed DC power source, and a resonance type switching circuit having a high voltage transformer and a resonance capacitor. The determination means 4
It drives based on the output amount determined by 1.

Next, the operation of the heating device having the above structure will be described in detail.

(Height Detection Step) When the power is turned on, first, as shown in FIG. 4, the light emitting element 33 of each of the distance sensors 31a to 31d emits light, and the condensing lens 35 condenses the object 11 to be heated. To irradiate. The light reflected here is received by the light receiving element 34 through the condenser lens 36. Then, the time from the light emission of the light emitting element 33 to the light reception of the light receiving element 34 is detected, and the distance sensor 3 is detected on the basis of the elapsed time.
Separation distances La to L from 1a to 31d to the object to be heated 11
Detect d. This is measured at each of the height positions Ha to Hd.

Here, when the detection value Ld of the distance sensor 31d has the same dimension as the oven width Lw of the heating device main body 13 as in the height position Hd at the uppermost stage in FIG. 3, the distance sensor 31d emits light. The light from the element 33 is the object to be heated 11
Since it means that the object 11 to be heated hits the chamber wall 13a of the heating device body 13 without hitting the
This means that the height is lower than the height of d (= 4h), and if the detection value Lc of the distance sensor 31c is smaller than Lw,
It is determined that the height of the object to be heated 11 is approximately the height of Hc (= 3h).

Similarly, the detection value Lc of the distance sensor 31c
Is equal to the oven width Lw, the height of the object 11 to be heated is determined to be the height of Hb (= 2h), and if the detection value Lc of the distance sensor 31b is equal to the oven width Lw as shown in FIG. The height of the object 11 is determined to be the height of Ha (= h).

(Cross-sectional area detecting step) From the distances La to Ld measured as described above and the oven width Lw,
The distances (diameters) LDa to LDd between the outer circumference of the object to be heated 11 and the central axis 19 are calculated by the equation (1).

LDa = Lw / 2-La LDb = Lw / 2-Lb LDc = Lw / 2-Lc LDd = Lw / 2-Ld (1) Next, as shown in FIG. Rotate around at a constant speed. The light emitting element 33 of each of the distance sensors 31a to 31d blinks each time the rotation of the rotary plate 12 advances by θ. Then, for each of the rotation angle positions P1, P2, ..., The diameter LDa of the object to be heated 11 at each of the height positions Ha to Hd.
LDd is calculated and stored based on the equation (1).

Here, as shown in FIG. 7, a certain rotation angle position P
R1 is a line segment having a length LD1 connecting 1 to the central axis 19 and length LD2 is a line connecting the central axis 19 to the rotation angle position P2 adjacent to the line segment.
Is R2, the area D1 of the fragment of the object to be heated 11 sandwiched between the two line segments R1 and R2 is approximately D1≈π {(LD1 + LD2) / 2} ² × (θ / 360 ° )… (2)

Similarly, the areas D2, D3, ... Of the fragments of the article 11 to be heated after the rotational angle position P2 are also obtained.

Finally, the cross-sectional area D of the object to be heated 11 is calculated by the following equation.

D = D1 + D2 + ... The above calculation is performed at all height positions Ha to Hd.

(Volume Detection Step) Based on the above results, the volume between the height positions Ha to Hd is obtained. Here, taking FIG. 3 as an example, when the volume between Ho and Ha of the object to be heated 11 is Va, the volume between Ha and Hb is Vb, and the volume between Hb and Hc is Vc, each volume Va is ~ Vc can be obtained by the following equation.

Va≈Da × h Vb≈Db × (2h−h) Vc≈Dc × (3h−2h) (3) where Da, Db, and Dc are objects to be heated at the respective height positions Ha to Hd. 11 is an approximate value of the cross-sectional area of 11. The volume of the object to be heated 11 is Hc to Hd in addition to V1 to V3.
There is a volume Vd between them, and there is also an error V ₂ between each approximate value Va to Vc and the actual volume. Therefore, when calculating the volume of the object to be heated 11, it is desirable to store these values of V ₂ and Vd as Vα in advance as a constant based on an empirical rule. That is, the approximate value V of the volume of the article to be heated 11 is obtained by summing the approximate values Va to Vc calculated as described above as in the following equation (however, in the example of FIG. 3, Vd = 0 Become).

V = Va + Vb + Vc + Vd + Vα (4) (Output adjusting step) The object to be heated 11 calculated as described above.
The total output amount of the first magnetron 21 and the second magnetron 22 is determined from the volume approximate value V of.

At the same time, from the height of the object 11 to be heated detected in the height detecting step and the cross-sectional areas Da to Dc at the height positions Ha to Hd detected in the cross-sectional area detecting step,
The length ratio of the object 11 to be heated in the vertical direction and the horizontal direction is obtained, and the relative output ratio of the first magnetron 21 and the second magnetron 22 is determined.

Then, the respective output amounts of the first magnetron 21 and the second magnetron 22 are calculated from the total output amount and the output ratio. Based on the calculated result, both inverter circuits 4
The output of both 2, 43 is adjusted, and the first magnetron 21
The drive of the second magnetron 22 may be controlled.

Then, as shown in FIG. 1, when the object to be heated 11 is high and vertically long, the microwave irradiation from the first magnetron 21 becomes strong, and the microwave irradiation from the second magnetron 22 becomes weak, resulting in a large area. Thus, the side surface of the object 11 to be heated can be heated intensively and efficiently.

On the other hand, when the object to be heated 11 is low and flat as shown in FIG. 2, the microwave irradiation from the first magnetron 21 becomes weak and the microwave irradiation from the second magnetron 22 becomes strong, resulting in a large area. It is possible to efficiently heat the flat surface of the object 11 to be heated.

At this time, for example, the shape of the gratin container, the height shape of the hot sake bottle, etc. are known in advance by the user, so that the shape detecting means 15 can detect the shape within the range of actual cooking. The type of the heated object 11 can be determined, and the heating time and output can be adjusted according to this determination. That is, if a storage means for storing several kinds of cooking patterns is provided in the control circuit 16, it is possible to store several kinds of patterns used by the user for actual cooking, and to cook in a one-touch manner as a so-called "automatic key". Become. In this case, the rotating dish 12 may be provided with a weight sensor, and the pattern may be stored according to the combination of the shape and the weight.

Further, in this embodiment, four distance sensors 31 are used.
Although the case of using a to 31d has been described, it is possible to actually increase the number of sensors, and even when the number of sensors is set to n, the target is achieved by the method described above.

By the method as described above, the uniform heating property in both the vertical direction and the plane direction can be made good and close to ideal.

[Second Embodiment] FIG. 8 is a schematic view of heating a vertically long object in the heating apparatus of the second embodiment of the present invention, and FIG. 9 is a heating apparatus of the second embodiment of the present invention. FIG. 10 is a schematic view showing a shape detection means, FIG. 11 is a view showing a shape detection angle of the shape detection means, and FIG. 12 is a shape detection operation.
13A is a sectional view in plan view, FIG. 13B is a sectional view in side view, and FIG.
1 is a control block diagram showing the control circuit, FIG. 14 is a diagram showing a state in which the detection operation position moves in accordance with the rotation of the rotary plate, FIG.
5 is a diagram showing the operation of detecting the diameter from the central axis of the object to be heated for each rotational angle position of the rotary dish, and FIG. 16 is a diagram showing the area of the fragment of the object to be heated sandwiched between the two rotational angle positions. is there.

In the heating device of this embodiment, as shown in FIGS. 8 to 16, one distance sensor 31 is used as the shape detecting means 15.
The purpose of x is to realize the same purpose as in the first embodiment and to reduce the number of parts.

As shown in FIGS. 8 to 12, the distance sensor 31x is rotatably mounted on the side wall of the oven (heating cabinet) 13a around the central axis 51a of the condenser lenses 35 and 36 in a side view. , For example, stepping motor 51
(See FIG. 13) changes the measurement angle by a predetermined angle. The drive for adjusting the angle of the stepping motor 51 is controlled by the angle adjusting means 52 in the control circuit 16. Therefore, it is possible to perform measurement at an arbitrary height position, and depending on the control method, it is possible to realize measurement with a considerably small error. As shown in FIG. 12, the distance sensor 31x has the same structure as that of the first embodiment, and the light emitted from the light emitting element 33 is reflected by the object 11 to be heated and then enters the light receiving element 34. Until the object 1 to be heated is detected from the distance sensor 31x based on the time taken here.
Detecting a distance L _1-1 ~L _nn to 1.

Further, the control circuit 16 of this embodiment is similar to that of FIG.
As described above, the configuration is basically similar to that of the first embodiment, but by changing the measurement angle of the single distance sensor 31x, the separation distances at different height positions of the object 11 to be heated can be set. Since the measurement is to be performed, the control operation is different from the first embodiment and is performed in the following procedure.

As shown in FIGS. 14 to 16, while rotating the object to be heated 11 on the rotary dish 12 about the central axis 19, the rotational angular positions P _1-1 , P _1-2 , ..., P _1-n , P _2-1 , ... P _2-n ,
..., for each P _nn, stores the distance L _1-1 ~L _nn detected by the distance sensor 31x.

[0055] Measurement angle of this time, the distance sensor 31x to the article to be heated 11, by rotating the variable around the axis 51a, keep each measured at each height position H _1-1 to H _nn. Then, the shape detection operation is completed only by rotating the object to be heated 11 once.

In this case, since the detection position shifts in the rotation direction as the object to be heated 11 rotates, the rotation positions between the heights are in phase with each other and the locus thereof becomes a bow in an oblique direction as shown in FIG. It will change. However, as will be described later, since the cross-sectional areas at each height position are finally summed up, there is no influence on the calculation result without considering these phases.

Further, as shown in FIG. 11, the distance sensor 31x
The net detection distance of k _1-1 to k _nn , distance sensor 31x
If the measurement angle of the object 11 to the object to be heated is φ ₁ to φ _n ,
Distance L _1-1 ~L _nn from the heating chamber 13a in the wall at any height H _1-1 to H _nn of the heated object 11, strictly, Therefore, taking these into consideration, the separation distance L _{1-1 to} L
Remember _nn .

As shown in FIGS. 14 to 16, the received separation distances L _{1-1 to} L _nn and the corresponding rotation angles θ _{1-1 to} θ _nn.
From θ _1-1 to θ for L _{1-1 to} L _1-n for each measurement line
Against _1-n through L _n-1 ~L _nn for θ _n-1 ~θ _nn, spaced angles [delta] _1-(1) between the measuring lines ~δ _{1- (n)} ... _{δ
It is} assumed that _{n- (1) to} δn- _(n) are also calculated.

Next, determine the cross-sectional area at any operational height h _1-1 ~h _n-1. First, as shown in FIG. 16, h _{0-1 to} h _1-1
Approximately the area in the arc surrounded by h _2-1 is set to A _1-1 , and the arbitrary calculated heights h _1-1 to h _n-1 from the rotation center axis 19 of the object to be heated 11 The distance is D _{1-1 to} D _n-1 , each point h _1-1 ,
If the angle between h _0-1 and h _2-1 is ζ _(1)-(1) , A _1-1 ≈ {(D _1-1 + D _2-1 ) / 2} × ζ _{(1 )-(1)} … (5)

Here, the measured values L _1-1 , L _1-2 to d _1-1 ,
calculates the d _1-2, also L _2-1, d _2-1, it calculates a d _2-2 from L _2-2. Then, regarding D _1-1 and D _2-1 , D _1-1 ≈d _1-1 + (d _1-1 −d _1-2 ) × Δh / H _1-1 D _2-1 ≈d _2-1 + (d _2-1 -d _2-2) approximated value calculated by × Δh / H _2-1. Where Δh is each height position H _1-1 ,
It is an arbitrary separation distance between H _2-1 .

Note that ζ _(1)-(1) is the following (6) (7)
An approximate value can be calculated from equation (8).

Ζ _(1)-(1) = θ _1-1 + δ _{1- (2)} -{α _1-1 + (θ _2-1 −α _2-1 )} (6) = θ _1-1 + Δ _{1- (2)} −α _1-1 + α _2-1 −θ _2-1 α _1-1 ≈ (θ _1-1 / H _1-1 ) × Δh (7) α _2-1 ≈ (θ _{2 −1} / H _2-1 ) × Δh (8) It should be noted that the height H _{0 of} the first measurement points P _{1-1 to} P _{1-n from} the rotary pan is _0.
Is close to 0, and H ₀ = 0 as an approximate value.

Therefore, the area A _1-n at the height of h _1-1 is A _1-n = {(D _1-1 + D _2-1 ) / 2} × ζ _(1)-(1) + { (D _2-1 + D _3-1 ) / 2} × ζ _(1)-(2) +… + [{D _n-1 + D _{(n + 1) -1} } / 2] × ζ _{(1)-( n)} ... (9) can be calculated as an approximate value.

Next, the cross-sectional area at each of the height h _1-1 of Δh, the height h _1-2 of Δh × 2, and the height h _1-n of Δh × n is A _1-n , If A _2−n , A _3−n , ..., A _nn , these can also be obtained as approximate values by an equation equivalent to the equation (9).

Here, the measurement point P of the highest height in FIG.
When the measurement angle is higher than _1-n, the light from the light emitting element 33 of the distance sensor 31x is transmitted to the object to be heated 11 by the object 1 to be heated.
It hits the inside of the top surface of the heating device body 11 without hitting 1, and the distance to the object to be heated 11 is the opening dimension L of the heating device body 11.
It is larger than half of w. Then, when such a large size is detected, the sequence is such that the shape of the object to be heated 11 does not exist at that position.

By calculating in this way, FIG.
15, P _1-1 , P for each rotation angle and each measurement line
The distance d _1-1 from the central axis 19 of the heated object 11 to the surface of the heated object 11 at the positions of _1-2 , ..., P _1-n to P _n-1 , P _n-2 , ..., P _nn. , D _1-2 , ..., d _1-n and d _n-1 ,
It is possible to measure and calculate d _n-2 , ..., D _nn .

Next, each height h _1-1 , obtained from the equation (9),
h _1-2, ..., from the approximate value cross-sectional area A _1-n ~A _nn in h _1-n, approximately determine the volume V of the heated object 11.

V = Δh (A _1-1 + A _1-2 + ... + A _1-n ) (10) Here, the measurement interval is set to a large value for n, and
It goes without saying that the measurement results will be accurate.

From the cross-sectional areas A _{1-n to} A _{nn of the} above approximate values,
It is determined whether the object to be heated 11 is vertically long or horizontally long.

Thereafter, similarly to the first embodiment, the output amount of each inverter circuit 42, 43 is determined based on the above judgment result.

The present invention is not limited to the above embodiment, and it goes without saying that many modifications and changes can be made to the above embodiment within the scope of the present invention.

For example, in the above-mentioned embodiment, the microwave oven for radiating and heating the microwave is described.
A heat source for radiant heating such as gas or an electric heating coil may be used as 1, 22.

Further, in the first embodiment, the rotary plate 12 was rotated at the time of shape detection, but instead of this, the oven chamber 13
If many distance sensors are arranged on the surface with a,
The object to be heated 11 can be grasped in a sillette shape. Furthermore, by disposing these distance sensors on two or more surfaces of the side wall of the oven chamber 13a, even if the object to be heated 11 is not placed in the center of the rotating dish 12, the shape of the rotating dish 12 can be accurately adjusted without rotating. I can grasp it well.

[0074] Further, in the second embodiment, it detects operation of the diameter from the central axis 19 in one of the height H _1-1 to H _nn of the heated object 11 the measurement angle is varied by the distance sensor 31x , This detection calculation operation is performed by using the rotary plate 12 as the central axis 19
Since each rotational angle position while rotating P1, P2, performed every ... it is around, can complete the shape detection in a single rotation of the object to be heated 11, the more times the height position H _1-1 to H _{For nn} , the object to be heated 11 may be rotated once for detection.

[0075]

As is apparent from the above description, according to claims 1 to 3 of the present invention, a first heater for horizontally heating an object to be heated and a second heater for planar heating are separately provided and heated. Sometimes, multiple distance sensors detect whether the object to be heated is vertically long or horizontally long, and based on this, the heating output ratio of both heaters is adjusted and heated, so when the object to be heated is tall and vertically long. The horizontal heating from the first heater becomes strong, and the flat heating from the second heater becomes strong when the object to be heated is low and flat. That is, the uniform heating property in both the vertical direction and the plane direction can be always good and close to ideal.

Further, according to claims 4 and 5, since only one distance sensor for detecting the separation distance for each measurement angle is required, the number of parts can be reduced, and moreover, the distance sensor can be set by adjusting the angle of the distance sensor. It becomes possible to measure an object at an arbitrary height position, and it is very effective if a measurement with a considerably small error can be realized.

[Brief description of drawings]

FIG. 1 is a schematic view of heating a vertically long object in a heating device according to a first embodiment of the present invention.

FIG. 2 is a schematic view of heating a horizontally long object in the heating device according to the first embodiment of the present invention.

FIG. 3 is a schematic view showing a shape detecting means.

FIG. 4 is a schematic diagram showing the structure of a distance sensor alone.

FIG. 5 is a control block diagram showing a control circuit.

FIG. 6 is a diagram showing an operation of detecting the diameter of the object to be heated from the central axis for each rotation angle position of the rotating dish.

FIG. 7 is a diagram showing an area of a fragment of an object to be heated which is sandwiched between two rotation angle positions.

FIG. 8 is a schematic view of heating a vertically long object in the heating device according to the second embodiment of the present invention.

FIG. 9 is a schematic view of heating a horizontally long object in the heating device according to the second embodiment of the present invention.

FIG. 10 is a schematic view showing a shape detecting means.

FIG. 11 is a diagram showing a shape detection angle.

12A and 12B show a shape detecting operation, FIG. 12A is a sectional view in plan view, and FIG. 12B is a sectional view in side view.

FIG. 13 is a control block diagram showing a control circuit.

FIG. 14 is a diagram showing a state in which the detection operation position moves as the rotary plate rotates.

FIG. 15 is a diagram showing an operation of detecting the diameter of the object to be heated from the central axis for each rotation angle position of the rotating dish.

FIG. 16 is a diagram showing an area of a fragment of an object to be heated which is sandwiched between two rotation angle positions.

FIG. 17 is a sectional view of a conventional heating device.

[Explanation of symbols]

 11 Heated Object 13 Heating Device Main Body 13a Heating Cabinet 14 Heating Means 15 Shape Detection Means 16 Control Circuit 21 First Heater 22 Second Heater 31x Distance Sensor

Claims (5)

[Claims] 1. A heating device comprising: a heating device main body for accommodating an object to be heated; and heating means for heating the object to be heated in the heating device main body, wherein the heating means is arranged to vertically move the object to be heated. A shape detecting means for detecting whether the object to be heated is vertically or horizontally long, which is composed of a first heater for uniformly heating and a second heater for uniformly heating the object to be heated in the horizontal direction. And a control circuit for adjusting the outputs of the both heaters, the control circuit, based on a signal from the shape detection means, when the object to be heated is determined to be vertically long, the first heating A heating device configured to increase the output of the second heater when the output of the heater is increased and the object to be heated is determined to be horizontally long. 2. The heating device according to claim 1, wherein the shape detecting means is composed of a plurality of distance sensors, and the distance sensors are respectively arranged at different height positions. 3. A heating method for a heating device for placing and heating an object to be heated on a rotating dish in the heating device body, comprising: a plurality of distance sensors arranged at different height positions in the heating device body during heating. , The diameter from the center axis at each height position of the object to be heated is detected and calculated, and this detection calculation operation is performed for each rotation angle position while rotating the rotating dish around the center axis, and based on this detection calculation result The approximate value of the cross-sectional area of the heated object at each height position is calculated, and it is determined from this calculation result whether the heated object is vertically or horizontally long.When it is determined that the heated object is vertically long, One heating device uniformly heats the object to be heated in the vertical direction, and when it is determined that the object to be heated is horizontally long, the second heating device heats the object to be heated uniformly in the horizontal direction. Heating method of heating device. 4. The shape detecting means according to claim 1 is composed of one distance sensor arranged on the inner wall surface of the heating chamber, and the measurement angle of the distance sensor with respect to the object to be heated is an arbitrary height of the object to be heated. The heating device is variable so as to measure the distance from the inner wall surface of the heating chamber. 5. A heating method for a heating device in which an object to be heated is placed and heated on a rotary plate in a main body of the heating device, wherein at the time of heating, measurement is performed by one distance sensor whose measuring angle to the object to be heated is variable While changing the angle, the diameter from the central axis at any height position of the object to be heated is detected and calculated, and this detection and calculation operation is performed for each rotational angle position while rotating the rotating dish around the central axis. An approximate value of the cross-sectional area of the heated object for each arbitrary height position is calculated based on this detection calculation result, and it is determined from this calculation result whether the heated object is vertically long or horizontally long. When it is determined that the first heating device uniformly heats the object to be heated in the vertical direction, and when it is determined that the object to be heated is horizontally long, the second heater uniformly distributes the object to be heated in the horizontal direction. Heating of a heating device characterized by heating Method.